I got the Harley Davidson 10 row oil cooler kit which I believe is made by Jagg. Unfortunately I don't have a temperature gauge to compare before and after temps. If the cooler isn't enough for your set up you may also look into installing a fan triggered by the front brake light circuit.

I've got the verticle mount coolers from Jagg mounted to the left down tubes on both of my Dyna's. I'm quite satisfied with the performance of both. One has the automatic thermostat and the other doesn't. Not a big fan of coolers mounted across the bottom of the frame where debris off the front tire is going. Synthetic oil is a good bet for you also.

I've read all the articles on the Jagg 10 row. I'm convinced it's the best.

rdondes,
Did you compare them to others offered from different manufactures?

Jagg P/N 2500
The Jagg 10-row Low mount Oil Coolers are designed for TC-88" and TC-96" Harley-Davidson Dyna motorcycles. The #2580 adds a CNC aluminum deep-chromed accent along the visible portion of the cooler. This compact unit offers 40 percent greater cooling capacity than the already high-performing Jagg 6-row cooler. A unique mounting system insures easy installation. The cooler's special in line turbulators and mini-louvered air fins insure unparalleled efficiency.http://www.setrabusa.com/jagg%20files/jagg%20pages/10-row-dyna-lowmount.htm

Harley Davidson Premium Oil Cooler Kit P/N 26110-05
This cooler was designed specifically for Harley-Davidson® to out-perform all other coolers in the industry. This cooler features a unique "Turbulator" system that evenly distributes oil across the cooling chambers. The air fins are designed to efficiently dissipate heat. This popular oil cooler has been re-designed to simplify installation and enhance performance. The larger heat exchanger provides additional cooling efficiency. Kit features an adapter plate with integrated thermostat that allows oil lines to connect to the oil filter bracket. The thermostat activates at 185°F (85°C). Kit comes complete with mounting hardware and precut oil lines. Kit includes Chrome Oil Cooler Cover.